Collapsible form.



C. D. MCARTHUR. coLLAPslBLE FORM.

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n.11. MCARTHUR. COLLAPSIBLE FORNI.

APPLICATION FILED NOV. 3, 1910.

Patented 11111.18, 1916.

3 SHEETS-SHEET 2.

1 ,g 4 1% 4J f I wl'rNEssEs lNvENToR THE COLUMBIA PLANOGRAPH 6o., WASHINGTON. D. c.

Patented J an. 18, 1916.

3 SHEETS-SHEET 3.

WITNESSES INVENTOR 'me COLUMBIA PLANUGRAPH co.,'wASHINa1-0N. D. C.

ilustran raras rarnnr ernten,

cHanLns nMeAR'rHUn, or rirrsnuaon, rnNNsYLvaNra, assrsNon rro THE staw coLLarsInLn srnnr. GENTE-nine contrarier, on rrrrsnunsn, PENNSYLVANIA, *n y CORPGRATION OF NEW JERSEY.

CLLAPSIBLE FORM.

Specification of Letters Patent.

Patented dan. 18, 1916.

Application filed November 3, 1910. Serial No. 590,566. i

To all whom it may concern Be it known that I, CHARLES D. Md ARTHUR, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have in vented certain new and useful improvements in Collapsible Forms, of which the following is a specification. f

The invention relates to collapsible metal forms, and particularly to large size forms for theformation of subways and similar passages in which the walls are of concrete or other similar material. The invention has for its primary objects; the provision of a form of large size which may be easily collapsed and moved from place to place; the provision of an improved arrangement whereby the sides of the form may be movedl and positioned with respect -to' the kwheels upon which they are mounted; and the provision of an improved arrangement of sup# porting and collapsing means. One embodiment of the invention is illustrated in accompanying drawings, wherein Fig. 1 is a transverse section through a pair of forms in position in a pair of parallel subways of slightly different shape, the form in the right hand subway being in collapsed position, and the one in the left hand subway being in expanded position, Figs. 2, 3 and 4 are enlarged detail views showing the method of mounting the wheels employed, Figgi being a section on the line IV-IV of Fig. 3,-and F ig. y5 is a longitudinal section through the form. The invention is illustrated as applied to a subway form of large size and peculiar shape, but it `willbe understood that the more important features of invention are 'regarded as applicable to a large variety of different shaped forms and to forms of small size as well as to those of large size. The two forms shown inV Fig. l are identical with ythe exception that the lower portion of the right hand wall of the right hand form is shortened by reason of the step or ,the

back andr secured detachably together by means of bolts. rlhe ribs for the upper `or top portions of the form consist of angles 3, 8, 3, placed baclr to back instead of the channels. The top members of the form are adapted to swing'downwardly asl indicated at the right of Fig. 1, and when in upper position the inner edges of the. top members are supported by means of the key member 5, which in turn is supported by means of struts 6 resting upon the tops of the beams 7, which beams extend transversely of the Vform at each of the pairsof Lchannels 2, 2. Pairs of brackets t, 4t are The lower edges of the angles 3, 3 arese- .cured pivotally to the channels 2, 2 by means of the plates 10 which plates'also carry at their lower ends the pivots 8. In order that the channels 2, 2 may be pulled inwardly to the positionindicated at the right of Fig. 1, when thetop members of the form swing downwardly, the straps 11 are provided, which straps are pivoted at their outer ends to the channels 2, 2 and at their inner ends to the plates 10, 10. As the top members swing down to the position indicated at the right of Fig. l, the plates 1l, 11 swing inwardly, `pulling the straps 10, 10 inwardly, and with them the channels 2, 2, such inward movement of the channels 2, 2 with respect to the beams being permitted by reason of the pin and slot connection 8, 7.

ln order to move the top portions of the form up and down, the pivoted struts 13 and la are provided,` the mechanism for operating such struts being substantially the same on each side of the form. Theicable 15 is secured to the upper portion of the strut 13 at the point 17, and extends around the pulley 18 on the beam 7, thence around an op erating pulley 19 on the longitudinally extending shaft 2O (Fig. 5), thence around ano-ther pulley 21 upon the beam 7 and over a pulley 22 on the beam 7 to the lower end of the strut 13. ein operating wheel 23 vis provided upon ,the shaft 20, and such wheel is rotated by means of the chain 24 extending to the power mechanism 25 located upon the side of the form. Any well known form of operating mechanism may be used at this point, the one employed being preferably of `the type employing a worm as lone of its lgear elements, so that the chain 24 .will be maintained in any'position in which it is .spect to the wheels.

placed. rllhe connections for operating the strut 14 on the opposite of the mold are substantially the Vsame as 'those just described with .the exception that the pulley corresponding to thepulley 2l is omitted.

Means lwhereby. the form is supported and moved from place to place also constitutes a feature of my invention as indicatedin Figs. l and 4. Angle irons 25 are mounted upon the corners of the abutments at the-bottom of the subway,-and these angles 25 serve asv asupport for the rails 26, the angles being supported in the subway kat the left of Fig. l by means ofthe beams 27, 28 and 29, and in the subway at the right of Fig. l by the beams 30, 8l and 32. Upon these rails are Amounted the wheels 33, which wheels are 'mounted upon the lower portions et the side members of the form in the manner indie cated in detail in Figs. 2, 3 and 4,y the purpose oi' the lpeculiar mounting shown being to provide for both the lateral and vertical movement of the sides of the form with re- A supporting frame-v work upon the lower portion of the side i member of the form is provided by the `transverse angle 34'riveted' to the ribs 2, 27

and bythe vertical angles 35 riveted at their upper ends to the transverse angle 34,l and at theirbottoni ends to a second transverse angle '36.A rlhe wheel 33 is carried in a`movl 'able cage consisting of the straps 37 and 38,

the strap 3 7 being provided with the ybolts yS9v extendingrthrough slots 4),l so that the cage may be adjusted vertically. *W hen the bolts 39 are loosened the cage may be adjusted bv means of the screws 4l mounted in ythe blocks 42. The strap 3S (Fig. 4)k carries the bearings 43 and 44 in which the shaft 45 is mounted. the wheel 83 being freely slid-y kside portions of; the ormmaybe readily moved vertically to their proper position and also moved in and out to properly position the side sections and also to permit of the detachment or' the lagging` from the concrete.

lThe operation is as follows, assuming that` i the partsare in the` position indicated in the right handportion of Fig. l. The wheels andr the form carried thereby are `moved along the track until thedesired location is vnew location.

i insecte The power mechanisms 25' on each side of the form are then successively operated, thus yrotating the pulleys 23 and causing the struts i8 and 14 to assume the position indicated in the right hand portion of Fig. 1.

The hey member 5 and the strut 6 are then placed in position, locking the parts of the form rigidly in the position sho-wn at the left handof Fig. l.. lt willbe seen that during the upward movement of the top members of the mold, the side members are Y moved laterally by reason of the connecting straps ll and the pin and slot connections between the brackets 4 and the plates 9 carried-by the beams 7. After the concrete has set aboutthe ormthe struts @and the key piece 5 are removed, yand the operation of the power means 25 causes the struts 18 and 14 to swing' bach to the position indicated at the right hand portion of Fig. l, such movement of the ystruts andot thetop portions of" the mold causing the side portions of the mold or form to move inward to the position indicated. r'he turn-buckle struts 47 and 48 l(Fig. l) are placed in position when the form is collapsed and serve tostilen and brace the form while it isbeing moved to a p The strut 49 serves as a means for moving the side member to which` lit is attached, in and out upon its wheels33.

. llavingthus described my invention and illustrated its use, what l claim as new and desire to secure-byLett-ers Patent is the following: ,Y l

l. `ln, combination ina collapsible mold, a pair of parallel rails, a flanged wheel upon each rail, a side moldmember upon each wheel mounted for movement in and` out with respect to the wheel upon which i-t is mounted, and means for moving theniembers in .and out, one side'member and its vwheel being independent of the other side member and wheel. f

2. ln combination in a collapsible mold; side .members movable inwardly and outwardly; supporting wheels carried by the lower portions oiI the sideineinbers and with respect to which the side members aremovv able laterally/,and means whereby the side members may be moved up and down with respect to the wheels.

3. ln combination in a collapsible mold,

wardly;.and supporting wheels carried Aby the lower portions or the side members, and mounted upon such lower portionsso that they the side members are movable laterally and vertically with respect thereto. p 4.7lnrcombinationin a collapsible mold; side members movable inwardly and outwardly; double flanged supporting wheels carried by the lower portions of the side 12o side members movable inwardly kand outf members; rails upon which the wheels are mounted; and means whereby the side members may be moved in and out with respect to the wheels and rails.

5. In combination in a collapsible mold; side members movable inwardly and outwardly; double flanged supporting wheels carried by the lower portions of the side members; rails upon which the wheels are mounted; and means whereby the side members may be moved vertically and laterally with respect to the wheels and rails.

6. In combination in a mold of inverse U-shape; side members movable inwardly and outwardly; a top member pivoted to the upper portion of each of the side members so as to swing inwardly and downwardly; a transverse member extending between the side members and carried thereby; and means on the transverse member for supporting the opposing inner edges of the top members.

7. ln combination in a collapsible mold; side members movable inwardly and outwardly; a top member pivoted to the upper portion of each of the side members so as to swing inwardly and downwardly; means for swinging the top members; and means whereby the movement of the top members causes the side members to move in and out.

8. In combination in a mold of inverse U-shape; side members movable inwardly and outwardly; a top member pivoted to the upper portion of each of the side members so as to swing inwardly and downwardly; a longitudinally extending key piece for holding the inner opposing edges of the top members when in upper position; a transverse member carried by the side members; and removable means carried by the transverse member for supporting the key piece.

9. ln, combination in a collapsible mold;

side members movable inwardly andeut wardly; a top member pivoted to the upper portion of each oip4 the side members so as to swing inwardly and downwardly about its pivot; a transverse beam having sliding engagement with the upper portions of the side members and pivotal connection tothe lower edges of the top members; means for swinging the top members; and other eonnections between the side members and top members whereby the movement of the top members causes the'side members to move in and out. v y

10. In combination in a mold of inverse U-shape; side members movable inwardly and outwardly; a top member having a side portion and an upper portion pivoted to the uppery portions of each of the side members on the inside of such side member soas to swing inwardly and downwardly; a'transyverse beam between and supported by the side members; and means on the beam for supporting the top members when in upper operative position.

1l. In combination in a mold, a wheel, a side member mounted thereon for vertical and lateral movement Awith respect to the wheel.

l2. The combination in amold or' inverse U-shape; a top member pivoted tothe upperk carried by the side members; a downwardly projecting swinging arm earried by. each top member; ilexible means for each arm carried by the beam and engaging the lower portion of the arm; and means for operatin g the flexible means to lift the arms and raise the top members.

In testimony whereof I have hereunto signed my name in the presence or" the two subscribed witnesses.

CHARLES D. MGARTHUR. Witnesses:

J. C. BRADLEY,

DOERING BELLINGER.

Copies of this patent may be obtanedvfor ve cents each, by addressing the Commissioner of Patents. Washington, D. 6. 

